A Coventry gym manager has brought new meaning to the saying ‘going underground’ – after racing around 42 of London’s tube stations for Comic Relief.

Steve Warner, general manager at PureGym Coventry, at the Skydome, took on the epic challenge of running 42 kilometres around London’s underground system.

The 41-year-old, who lives in Nuneaton, clocked up 30 kilometres between each station and then up and down 12 kilometres of stairs and escalators underground – all dressed in a green ‘morph’ suit.

He started his challenge last Saturday at 9.30am from King’s Cross Station – finishing back at the famous station around five and a half hours later.

Steve told the Telegraph about what his marathon challenge involved. He said: “I raced between 42 stations.

“I would go through the barrier and down to the platform, touch the yellow line and run back out.”

He added: “The route included Covent Garden which was the worst station because I had to run up and down the 193 stairs

“The hardest part of the run was Russell Square because it was the last station before I finished.

“I even managed to see the Houses of Parliament and Buckingham Palace on my way round.”

What made the long distance endurance test even more impressive was that Steve ran the entire thing wearing a green morph suit – which has previously cropped up in many Coventry fundraisers and publicity stunts.

Steve Warner at the Coventry Half Marathon 2012

Steve said: “I teach around seven to eight classes a week which helped with training.

“I’ve done long distance races before, such as Iron Man.”

He added: “I bought a travel card for the day to get in and out of the stations.

“Next time though I’d bring some friends along and put them in different stations to help with motivation.”

Steve, who will be donating any sponsorship he receives to Comic Relief, said: “It was for a good cause and hopefully made people smile.